What is a Phased Array Radar?

January 16, 2026

What is a Phased Array Radar?

I. Fundamentals of Radar Technology

Radar (Radio Detection and Ranging) is a system that uses electromagnetic waves to detect and analyze objects. Its core working principle is to transmit radio signals and receive the signals reflected by targets, thereby extracting key parameters such as distance, azimuth, altitude, and speed.

1.1 Applications

Military: Target detection, positioning, tracking, identification, early warning systems, and missile guidance.

Civilian fields: Air/ground traffic control, weather forecasting, geological surveys, and autonomous vehicle navigation.

1.2 System Components

Transmitter: Generates high-frequency electromagnetic waves and amplifies their power for transmission.
Antenna: Radiates the transmitted signals and captures the reflected echoes.
Receiver: Amplifies and processes the returned signals to separate target data.
Signal Processor and Display: Analyzes echo parameters, calculates target indicators, and visualizes spatial/temporal trajectories.

1.3 Classification

Classified by frequency band: Meter wave, millimeter wave, terahertz, and lidar (Light Detection and Ranging).

Classified by scanning mechanism: Mechanically scanned radar and electronically scanned phased array radar.

II. Phased Array Radar: Principles and Capabilities

Traditional mechanical radar systems rely on the physical rotation of the antenna to change the beam direction. In contrast, phased array radar adopts a fixed antenna array and realizes electronic beam control through phase shift technology. This eliminates mechanical movement, enabling fast and full-coverage scanning.

2.1 Key Advantages

High-speed multi-target tracking: Millisecond-level beam redirection can simultaneously detect, track, and image multiple objects.
Accuracy and anti-jamming capability: Adaptive beamforming enhances spatial resolution, while dynamic beam management suppresses signal interference.
Multi-task flexibility: Simultaneously performs tasks such as surveillance, fire control, and communication relay.

2.2 Types of Phased Array Radars

Passive Electronically Scanned Array (PESA): Centralized transmitter/receiver unit; cost-effective but with limited flexibility.
Active Electronically Scanned Array (AESA): Each antenna element integrates a dedicated Transceiver (T/R) module, providing excellent redundancy, beam control, and functionality.

2.3 Deployment Platforms

Military: Fighter jets (e.g., F-35), Airborne Warning and Control Systems (AWACS), naval destroyers, land-based missile defense systems, and satellites.

Civilian: Meteorological radar networks, air traffic control, and earth observation satellites.

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